Use std::replace for replacing chars in strings.

Find uses of `cmSystemTools::ReplaceString` where both `replace` and
`with` are string literals with a size of one.

Automate with:

git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\(.\)\", \"\(.\)\");|std::replace(\1.begin(), \1.end(), '\2', '\3');|g"
git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\(.\)\", \"\\\\\\\\\");|std::replace(\1.begin(), \1.end(), '\2', '\\\\\\\\');|g"
git grep -l ReplaceString | xargs sed -i "s|cmSystemTools::ReplaceString(\([^,]*\), \"\\\\\\\\\", \"\(.\)\");|std::replace(\1.begin(), \1.end(), '\\\\\\\\', '\2');|g"

1 files changed, 1 insertions, 1 deletions

diff --git a/Source/cmLocalUnixMakefileGenerator3.cxx b/Source/cmLocalUnixMakefileGenerator3.cxx
index 88c6d61..defac95 100644
--- a/Source/cmLocalUnixMakefileGenerator3.cxx
+++ b/Source/cmLocalUnixMakefileGenerator3.cxx
@@ -1190,7 +1190,7 @@ std::string cmLocalUnixMakefileGenerator3::CreateMakeVariable(
   // if this there is no value for this->MakefileVariableSize then
   // the string must have bad characters in it
   if (!this->MakefileVariableSize) {
-    cmSystemTools::ReplaceString(ret, ".", "_");
+    std::replace(ret.begin(), ret.end(), '.', '_');
     cmSystemTools::ReplaceString(ret, "-", "__");
     cmSystemTools::ReplaceString(ret, "+", "___");
     int ni = 0;